-- local tween = require 'tween'

-- local balls = {}
-- local balls_final_radius = 8
-- local balls_rows         = 20
-- local balls_columns      = 20
-- local balls_final_color  = {255,255,255}

-- local duration = 2

-- local screen_w,screen_h = love.graphics.getDimensions()

-- local function get_keys(tbl)
-- 	local keys,len = {},0
-- 	for k in pairs(tbl) do
-- 		len = len + 1
-- 		keys[len] = k
-- 	end
-- 	return keys
-- end

-- local easing_keys = get_keys(tween.easing)

-- local function pad(x, min, max)
-- 	return math.max(math.min(x, max), min)
-- end

-- local function get_ball_target(column, row)
-- 	local x = screen_w/2 - balls_final_radius * balls_columns + balls_final_radius * column * 2
-- 	local y = screen_h/2 - balls_final_radius * balls_rows    + balls_final_radius * row * 2

-- 	return {x=x, y=y, radius = balls_final_radius}
-- end

-- local function create_ball(column, row, i)

-- 	local dur = duration + i * 0.01
-- 	local angle = 2 * math.pi * balls_columns * balls_rows / i

-- 	local ball = {
-- 		x = screen_w / 2 + (screen_w) * math.cos(angle),
-- 		y = screen_h / 2 + (screen_h) * math.sin(angle),
-- 		radius = math.random(balls_final_radius / 2, balls_final_radius * 4),
-- 		r = math.random(0,255),
-- 		g = math.random(0,255),
-- 		b = math.random(0,255)
-- 	}

-- 	local easing_key  = easing_keys[math.random(1, #easing_keys)]
-- 	local easing      = tween.easing[easing_key]

-- 	local target = get_ball_target(column, row)

-- 	ball.tweens = {
-- 		tween.new(dur, ball, target, easing),
-- 		tween.new(dur, ball, {r=255,g=255,b=255}, 'inExpo')
-- 	}

-- 	return ball
-- end

-- function love.load()
-- 	local len = 0
-- 	for row=1, balls_rows do
-- 		for column=1, balls_columns do
-- 			len = len + 1
-- 			balls[len] = create_ball(column, row, len)
-- 		end
-- 	end
-- end

-- function love.update(dt)
-- 	if love.keyboard.isDown(' ') then dt = -dt end
-- 	for i=1, #balls do
-- 		for j=1, #balls[i].tweens do
-- 			balls[i].tweens[j]:update(dt)
-- 		end
-- 	end
-- end

-- function love.draw()
-- 	local ball, r,g,b
-- 	for i=1, #balls do
-- 		ball = balls[i]
-- 		r,g,b = pad(ball.r, 0, 255), pad(ball.g, 0, 255), pad(ball.b, 0, 255)
-- 		love.graphics.setColor(r,g,b)
-- 		love.graphics.circle('fill', ball.x, ball.y, ball.radius)
-- 		love.graphics.setColor(0,0,0)
-- 		love.graphics.circle('line', ball.x, ball.y, ball.radius)
-- 	end

-- 	local msg = [[
--     tween.lua demo
--     press space to rewind
--   ]]

-- 	love.graphics.setColor(255,255,255)
-- 	love.graphics.print(msg, 10, 10)
-- end

-- function love.keypressed(k)
-- 	if k == 'escape' then love.event.quit() end
-- end
